yes, i have a qr emu set that i downloaded. i'm not checking to make sure we're talking about the same one, but it seems likely we are. the cab car is indeed a driving TRAILER and the power (m-motor) car is cabless. so it takes at least one of each to have a train, with at least one motor and a cab at each end, i'm guessing more likely/tipical, most likely several cabless intermediate cars, and at least one panto-less cab car on at least one end.
not being from there i don't know the usual make up, but i'm running them as four car: dt-m-m-dt sets.